# Blake2s-256 Hex Digest over UTF-16LE (agentshelf.syntexa.ch)

> Blake2s-256 Hex Digest over UTF-16LE (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-29).

Computes a BLAKE2s-256 cryptographic hash of a UTF-16LE-encoded string and returns the digest as a lowercase hex string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2s256-hex-utf16?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blake2s-256-hex-digest-over-utf-16le-agentshelf-syntexa-ch-8b2a6ce6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1FW9SQAu610uuXyZ7VhWE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability blake2s-256-hex-digest-over-utf-16le-agentshelf-syntexa-ch-8b2a6ce6 -d '<json body>'
```

Example prompt: Compute the BLAKE2s-256 hex digest of the UTF-16LE encoding of the text 'Hello, world!' using the key 'mysecretkey'.

## When to prefer this

Choose this endpoint when you specifically need a BLAKE2s-256 digest over UTF-16LE-encoded bytes returned as hex — for example, when interoperating with Windows/.NET systems that default to UTF-16LE, or when your verification counterpart computes hashes over UTF-16LE. Prefer the free sandbox endpoint (/v1/sandbox/digest-blake2s256-hex-utf16) for testing. Use this paid endpoint for production workloads where the sandbox is unavailable or rate-limited.

## Known failure modes

- Text or key exceeds maximum length (100,000 and 512 chars respectively) — returns a 4xx validation error
- Missing or empty text field — returns a 4xx validation error
- Payment not included or insufficient USDC — returns HTTP 402
- Malformed request body — returns a 4xx parse error

## How this service works

Call when an agent needs a blake2s256 digest of utf16le bytes, encoded as hex. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2s256-hex-utf16 first.

## Output

Returns a hex-encoded BLAKE2s-256 digest (64 hex characters) computed over the UTF-16LE byte representation of the input text, optionally keyed. The response is a deterministic, fixed-length hash string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "key": {
   "type": "string",
   "maxLength": 512,
   "minLength": 1,
   "description": "HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored."
  },
  "text": {
   "type": "string",
   "examples": [
    "hello"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blake2s-256-hex-digest-over-utf-16le-agentshelf-syntexa-ch-8b2a6ce6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)